I'm in an NHS group at the moment. We were weighed last week, about half a pound difference to my home scales. One woman said the NHS scales were 8kg heavier than her slimming world group scales, that's over a stone!

You have to remember that it's not the actual number that matters, but the change in that number over time. Doesn't matter if you weigh a few pounds heavier on one than the other, provided they both go down at about the same rate.

Unless they are calibrated side by side and you weigh at exactly the same time on each, it's unlikely that 2 sets of scales will ever match completely.

I'm about 1.5-2lb lighter at home (WW scales ironically!). I only count my weight on the SW weigh in scales as my current weight but my home scales calculate body fat % so I record that too on my Fitbit.